I work with analytic tools to watch production systems and they boil my data down to a pathetic number of datapoints prior to rendering, when you know computers — even in a browser — are vastly more capable.
I don't think systems like this have ever been really limited to the amount of data they can _present_. A bigger limiting factor is the volume of data they can ingest, at what cardinality (ideally arbitrary), and how quickly they can get it back to you, transformed in some way (e.g. "i want to see p95").
That said, things like SignalFx or Datadog are certainly slow at the presentation layer, too ;)
I work with analytic tools to watch production systems and they boil my data down to a pathetic number of datapoints prior to rendering, when you know computers — even in a browser — are vastly more capable.